Quantity   Component name
1 × Arduino Uno
1 × Seeeduino Xiao I needed something that would run the keyboard.h library and I stumbled on to the Xiao. It's under $5 and about the size of your thumb.
1 × Ultrasonic Distance Sensor - HC-SR04
1 × Micro USB (Male) to USB 2.0 (Female) Adapter, On-The-Go (OTG) Convertor Cable
1 × jumper wires
1 × Pi Zero Power Supply
1 × USB Cable Compatible with Arduino IDE